Corrosion of Heat Treated Electroless-Ni Plated Mild Carbon Steels in Dilute H<sub>2</sub>SO<sub>4</sub>

Abstract

Abstract:The corrosion of heat-treated Electroless-Nickel (EN) plated mild carbon steel (MCS) in dilute H 2 SO 4 is investigated and reported in the study. The MCS samples were electroless-Ni plated in alkaline Nimudeen 850. EN plated samples were soaked at different selected temperatures between 150-370 °C at constant time. The weight loss of the specimens by full immersion method was employed to assess the corrosion damage and corrosion rates of the as-received, EN plated MCS and four heat treated EN plated samples in the 0.5 M H 2 SO 4 solution. The test specimens were regularly examined at every 12 hrs interval for 30 days (720 hrs). The materials corrodes in 0.5 M H 2 SO 4 in the order of MCS10 > MCS14 > MCS15 > MCS11 > MCS13 > MCS12. Based on the results obtained, it will be justified to choose EN-plated samples (MCS 11) and the heat treated EN film (MCS12 and MCS13) for the purposed of solving the problem of corrosion in the medium. This is because; the application of EN deposition reduced the corrosion of MCS at much lower rate than the heat-treated EN film (MCS14 and MCS15) in 0.5 M H 2 SO 4 environment. Atomic Absorption Spectrometer (AAS) Thermo series 2000 model and Scanning Electron Microscopy (SEM) with the Energy Dispersive X-Ray (EDX) facilities (Jeol JSM-7600F model) were used to ascertain the chemical compositions and the microstructures of samples.

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

“…The present results fall within reach to understanding the performance and the differences in the wear properties of the test samples previously reported by Ajibola et al, [20]. The corrosion rate is comparatively lower than what is obtained for other Al alloy types and steels in other media (such as acid and alkali) as reported in the literatures [5,15,17,27].…”

“…where Vw is the volume of wear volume, Ac is the cross-sectional area, and d is the distance slid [5] which in the present case d is the same as L Wear resistance Rw, is simply defined as the reciprocal of wear volume Vw (in cm -3 or mm -3 ) as Equation 6.…”

“…Aluminium can react with acids, bases and alkalis due to its amphoteric nature. Thus they are designed and manufactured with adequate consideration for their surface protection with the view to reducing the effects of wear and corrosion on surface [4][5][6][7]. Hydraulic brake and clutch master cylinders and pistons are widely made from aluminium alloys and steels [8,9].…”

Comparative effects of corrosion on electroless -nickel plated A6061 alloys in DOT3 brake fluid

“…The integrity of EN film for wear and corrosion protection applications is solely dependent on many factors such as the metallurgical qualities of the film [34][35][36][37][38][39][40]. The film quality is assessed by the chemistry (composition), mechanical strength, film continuity, the tenacity, adhesion, porosity and some other physical parameters such as the topography of the surface roughness.…”

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“…Electroplating uses various materials, such as chromium (Cr), cadmium (Cd), nickel (Ni), copper (Cu), silver (Ag), gold (Au), and others [6][7]. Electroplating using nickel-based materials is used to increase the usability, value, and marketability of goods to consumers and manufactured products.…”